Modeling and analysis of peer-to-peer networks, wireless networks, and TCP/IP networks

在过去的十年中，通信和网络技术得到了快速发展。然而，快速发展也带来了许多问题。在这个研究计划中，我将研究如何提高各种通信网络的性能和安全性，例如点对点、无线（包括ad-hoc和传感器网络）和TCP网络。在宽带网络中，可伸缩性是一个非常重要的问题，特别是当用户数量越来越大时。点对点（P2P）技术是解决这一问题的一个很有前途的解决方案。我将研究P2P系统的效率和激励机制。在无线网络中，现有系统的性能还远远不能令人满意。跨层优化被认为是未来无线网络性能提升的关键技术。我计划将其应用于多跳无线网络中的联合分布式调度和拥塞控制问题。安全一直是网络的一个重要问题。我将研究如何在无线自组织网络中处理自私或恶意用户的安全问题。在传统的排队网络中，我对TCP拥塞控制下网络的排队分析很感兴趣，这将有助于我们改进下一代网络的TCP协议。

Communication and networking technologies have undergone rapid development in the past decade. However, the rapid development also poses many problems. In this research program, I will investigate how to improve the performance and security of various communication networks, such as peer-to-peer, wireless (including ad-hoc and sensor networks), and TCP networks. In broadband networks, scalability is a very important issue, especially when the user population is getting larger. Peer-to-Peer (P2P) technology is a very promising solution to this problem. I will study the efficiency and incentive mechanisms of P2P systems. In wireless networks, the performance of current systems is still far from being satisfactory. Cross-layer optimization has been believed to be the key technology for good performance in future wireless networks. I plan to apply it to the problem of joint distributed scheduling and congestion control in multi-hop wireless networks. Security has always been an important issue for networks. I will investigate the security problem of how to deal with selfish or malicious users in a wireless ad-hoc network. In the traditional queueing networks, I am interested in the queueing analysis of networks under TCP congestion control, which in return will help us to improve the TCP protocol for next generation networks.